Polarization and fundamental sensitivity of 39K(133Cs)-85Rb-21Ne co-magnetometers

The hybrid optical pumping spin exchange relaxation free(HOPSERF)atomic co-magnetometers make ultrahigh sensitivity measurement of inertia achievable.The wall relaxation rate has a big effect on the polarization and fundamental sensitivity for the co-magnetometer,but it is often neglected in the experiments.However,there is almost no work about the systematic analysis of the influence factors on the polarization and the fundamental sensitivity of the HOPSERF co-magnetometers.Here we systematically study the polarization and the fundamental sensitivity of 39K-85Rb-21Ne and 133Cs-85Rb-21Ne HOPSERF co-magnetometers with low polarization limit and the wall relaxation rate.The 21Ne number density,the power density and wavelength of pump beam will affect the polarization greatly by affecting the pumping rate of the pump beam.We obtain a general formula on the fundamental sensitivity of the HOPSERF co-magnetometers due to shot-noise and the fundamental sensitivity changes with multiple systemic parameters,where the suitable number density of buffer gas and quench gas make the fundamental sensitivity highest.The fundamental sensitivity 7.5355×10^-11 rad·s^-1·Hz^-1/2 of 133Cs-85Rb-21Ne co-magnetometer is higher than the ultimate theoretical sensitivity 2×10^-10 rad·s^-1·Hz^-1/2 of K-21Ne co-magnetometer.     

声电协同催化氧化降解苯甲酸的研究

苯甲酸是许多复杂有机物隆解的中间产物,对人体危害巨大,因此苯甲酸的处理技术也是人们研究的课题之一,有机物降解的中间产物,对人体危害巨大,因此苯甲酸的处理技术也是人们研究的课题之一,有机溶剂萃取技术[1]、光催化氧化技术[2-3]、多种酶联合的厌氧消化[4]、以苯甲酸为唯一     

酸性氧化电位水制备的影响因素

对酸性氧化电位水的产生条件进行单因素分析的结果表明,在实验研究范围内电解质浓度越高、电压越大、极间距越小、电解时间越长,酸性氧化电位水的水质越好.考虑到制水成本和效率,制备酸性氧化电位水的最佳反应参数为:CNaCl=1.5～2.5g/L,U=15～20V,d=20～30mm,t=2～4min.     

三氧化钨溶胶稳定机理及薄膜结构变化特征探讨

本文以钨酸钠阳离子树脂酸化法制备三氧化钨溶胶,采用提拉法成膜,并讲座了溶胶稳定和成膜的机理,通过TG－DTA和IR分析探讨了固体薄在热算是过程中的结构变化,实验结果表明,双氧水和乙醇与钨酸络合,使溶胶稳定,挥发性强的小分子配体（如乙醇）对成膜有利,TG－DTA和IR分析结果表明,随着热处理温度的提高,薄膜中多聚钨酸离子（或者产氧化钨分子簇）进一步缩合,WO6八面对称性逐渐增强。     

环糊精改性Fe_3O_4磁性液体的制备与感应加热特性

采用两步法制备β-环糊精改性纳米四氧化三铁磁性液体,探讨了pH值、改性剂用量、改性温度对改性效果的影响.改性水基磁性液体性能稳定,饱和磁化强度可达1.78emμ/g.在高频交变磁场下,磁性液体升温超过41℃,可用于肿瘤的磁热疗研究.